MRCOOL® Signature Series 36,000 BTU Stud-Mount Air Handler 3 Ton R-454B ECM — MCAEAWPEF36E21AA

Product Description 

The MRCOOL® Signature Series MCAEAWPEF36E21AA is a 36,000 BTU (3-ton) stud-mount air handler engineered for projects where space efficiency, quiet operation, and dependable performance are critical. Designed to install cleanly between standard wall studs, this unit is ideal for remodels, additions, apartments, multi-family properties, and modern builds where traditional air handlers are simply too bulky.

Even with its slim, space-saving design, this air handler delivers strong, consistent airflow at 1,095 CFM, making it a powerful match for MRCOOL® Signature Series top-discharge condensers and heat pumps. Flexible front or bottom return air configurations allow installers to adapt the system to the layout of the space, while the upflow airflow design promotes efficient, balanced air distribution throughout the conditioned area.

At the core of the system is a high-efficiency ECM blower motor (1/2 HP), providing precise airflow control, lower electrical consumption, and quieter operation compared to standard PSC motors. The fully insulated galvanized steel cabinet helps reduce sound levels, minimize condensation, and protect against energy loss, contributing to long-term system reliability and comfort.

Routine maintenance is simplified with the integrated filter rack, allowing quick filter changes without disassembling the unit. For colder climates or supplemental heat needs, the MCAEAWPEF36E21AA supports optional electric heat kits (5kW, 7.5kW, or 10kW). Designed for R-454B refrigerant, this air handler meets modern environmental standards and is built for the future. Backed by a 10-year parts warranty, the MRCOOL® Signature Series 36K Stud Mount Air Handler delivers dependable comfort, smart engineering, and installation flexibility in one compact solution.

 KEY FEATURES & BENEFITS 

• 36,000 BTU / 3 Ton Capacity – Ideal for large single zones or open layouts
• Stud-Mount Design – Fits between standard wall studs
• Compact, Space-Saving Cabinet – Perfect for tight installations
• 1,095 CFM Airflow – Strong, consistent air delivery
• High-Efficiency ECM Blower Motor (1/2 HP) – Quiet, energy-saving performance
• R-454B Refrigerant Compatible – Low-GWP, future-ready system
• Front or Bottom Return Air Options – Flexible installation configurations
• Upflow Airflow Direction – Efficient system operation
• Durable Galvanized Steel Cabinet – Built for long service life
• Fully Insulated Cabinet – Reduced noise and condensation
• Built-In Filter Rack – Easy maintenance and filter replacement

• Optional Electric Heat Kits – models below 
• 1. 5kW,      Model- MCAEHWD5X1AA
• 2. 7.5kW,   Model- MCAEHWD7X1AA
• 3. 10kW,    Model- MCAEHWD10X1AA

• AHRI Certified / UL / CSA / ETL Listed – Verified safety and performance

ELECTRICAL REQUIREMENTS

• Voltage: 208/230V
• Phase: Single
• Max Fuse / Breaker: 6 Amps
• Minimum Circuit Ampacity (MCA): 4.5 Amps

DIMENSIONS & WEIGHT

Installed Unit Dimensions

• Width: 22.125 in
• Height: 39.5 in
• Depth: 19 in

Weight

• Net Weight: 110 lbs
• Shipping Weight: 120 lbs

WARRANTY INFORMATION 

• Base Warranty
  
• ✅ 10-Year Parts Warranty
• ✅ Limited Lifetime Compressor Warranty (when paired with compatible system) 

FREQUENTLY ASKED QUESTIONS  

Q: What condensers does this air handler work with?

A: It is designed for use with MRCOOL® Signature Series top-discharge condensers and heat pumps.

Q: Can this unit be installed inside a wall cavity?

A: Yes. This model is specifically engineered for between-stud wall installation.

Q: Does this air handler include electric heat?

A: No, but optional electric heat kits (5kW, 7.5kW, or 10kW) are available.

Q: What refrigerant does this system use?

A: R-454B refrigerant, meeting modern environmental regulations.

Q: Is professional installation required?

A: Professional installation is recommended to ensure proper electrical, refrigerant, and code compliance.

Why Buy From MRCOOL DIRECT?

When you order from MRCOOL Direct, you get:

• ✅ Authorized MRCOOL® dealer – Your warranty is protected
• ✅ Factory-fresh units – No refurbished or mystery sources
• ✅ Fast U.S. shipping – Most in-stock items ship in 1–3 business days
• ✅ Financing options – Make high-efficiency comfort more affordable
• ✅ Real product support – Help with sizing, line set selection, and DIY questions
• ✅ No third-party marketplace middlemen – Just genuine MRCOOL® systems from a trusted MRCOOL® dealer.

BUY DIRECT!

Feel Free to call us anytime. Family Friendly help just a dial away. We love talking HVAC
615-553-8118

Family owned & USAs #1 MRCOOL® Authentication Dealer.